/* Copyright (c) 2010, Carl Burch. License information is located in the
* com.cburch.logisim.Main source code and at www.cburch.com/logisim/. */
package com.cburch.logisim.instance;
import java.awt.Font;
import java.awt.Graphics;
import com.cburch.logisim.circuit.Circuit;
import com.cburch.logisim.comp.Component;
import com.cburch.logisim.comp.ComponentDrawContext;
import com.cburch.logisim.comp.ComponentUserEvent;
import com.cburch.logisim.comp.TextField;
import com.cburch.logisim.comp.TextFieldEvent;
import com.cburch.logisim.comp.TextFieldListener;
import com.cburch.logisim.data.Attribute;
import com.cburch.logisim.data.AttributeEvent;
import com.cburch.logisim.data.AttributeListener;
import com.cburch.logisim.data.AttributeSet;
import com.cburch.logisim.data.Bounds;
import com.cburch.logisim.data.Location;
import com.cburch.logisim.gui.main.Canvas;
import com.cburch.logisim.proj.Action;
import com.cburch.logisim.tools.Caret;
import com.cburch.logisim.tools.SetAttributeAction;
import com.cburch.logisim.tools.TextEditable;
import static com.cburch.logisim.util.LocaleString.*;
public class InstanceTextField implements AttributeListener, TextFieldListener,
TextEditable {
private Canvas canvas;
private InstanceComponent comp;
private TextField field;
private Attribute<String> labelAttr;
private Attribute<Font> fontAttr;
private int fieldX;
private int fieldY;
private int halign;
private int valign;
InstanceTextField(InstanceComponent comp) {
this.comp = comp;
this.field = null;
this.labelAttr = null;
this.fontAttr = null;
}
void update(Attribute<String> labelAttr, Attribute<Font> fontAttr,
int x, int y, int halign, int valign) {
boolean wasReg = shouldRegister();
this.labelAttr = labelAttr;
this.fontAttr = fontAttr;
this.fieldX = x;
this.fieldY = y;
this.halign = halign;
this.valign = valign;
boolean shouldReg = shouldRegister();
AttributeSet attrs = comp.getAttributeSet();
if (!wasReg && shouldReg) attrs.addAttributeListener(this);
if (wasReg && !shouldReg) attrs.removeAttributeListener(this);
updateField(attrs);
}
private void updateField(AttributeSet attrs) {
String text = attrs.getValue(labelAttr);
if (text == null || text.equals("")) {
if (field != null) {
field.removeTextFieldListener(this);
field = null;
}
} else {
if (field == null) {
createField(attrs, text);
} else {
Font font = attrs.getValue(fontAttr);
if (font != null) field.setFont(font);
field.setLocation(fieldX, fieldY, halign, valign);
field.setText(text);
}
}
}
private void createField(AttributeSet attrs, String text) {
Font font = attrs.getValue(fontAttr);
field = new TextField(fieldX, fieldY, halign, valign, font);
field.setText(text);
field.addTextFieldListener(this);
}
private boolean shouldRegister() {
return labelAttr != null || fontAttr != null;
}
Bounds getBounds(Graphics g) {
return field == null ? Bounds.EMPTY_BOUNDS : field.getBounds(g);
}
void draw(Component comp, ComponentDrawContext context) {
if (field != null) {
Graphics g = context.getGraphics().create();
field.draw(g);
g.dispose();
}
}
@Override
public void attributeListChanged(AttributeEvent e) { }
@Override
public void attributeValueChanged(AttributeEvent e) {
Attribute<?> attr = e.getAttribute();
if (attr == labelAttr) {
updateField(comp.getAttributeSet());
} else if (attr == fontAttr) {
if (field != null) field.setFont((Font) e.getValue());
}
}
@Override
public void textChanged(TextFieldEvent e) {
String prev = e.getOldText();
String next = e.getText();
if (!next.equals(prev)) {
comp.getAttributeSet().setValue(labelAttr, next);
}
}
@Override
public Action getCommitAction(Circuit circuit, String oldText,
String newText) {
SetAttributeAction act = new SetAttributeAction(circuit,
getFromLocale("changeLabelAction"));
act.set(comp, labelAttr, newText);
return act;
}
@Override
public Caret getTextCaret(ComponentUserEvent event) {
canvas = event.getCanvas();
Graphics g = canvas.getGraphics();
// if field is absent, create it empty
// and if it is empty, just return a caret at its beginning
if (field == null) createField(comp.getAttributeSet(), "");
String text = field.getText();
if (text == null || text.equals("")) return field.getCaret(g, 0);
Bounds bds = field.getBounds(g);
if (bds.getWidth() < 4 || bds.getHeight() < 4) {
Location loc = comp.getLocation();
bds = bds.add(Bounds.create(loc).expand(2));
}
int x = event.getX();
int y = event.getY();
if (bds.contains(x, y)) return field.getCaret(g, x, y);
else {
return null;
}
}
}